417A
Triode · IHT · 9-pin Noval · 1956
“Same as 5842.”
Medium-gain triode for driver and line stage applications
Datasheet ↗SPICE
GAIN FACTOR0
PLATE IMPEDANCE0kΩ
TRANSCONDUCTANCE0mA/V
GAIN38%
POWER11%
DRIVE98%
LINEARITY81%
TYPICAL OPERATING POINT
EXECUTIVE SUMMARY
The 417A is a indirectly-heated triode from Western Electric, introduced around 1956. It provides a gain factor (μ) of 38 with 1580Ω plate resistance. Commonly used in phono / preamp applications. Same as 5842.
APPLICATIONS
Voltage amplifierHeadphone outputPhono stage
Generic triode phono / preamp stage
• Hi-Fi stereo• Headphone amp
VS 5842
HISTORY
Introduced1956ManufacturerWestern ElectricEquivalents5842
Golden AgeSPECIFICATIONS
Heater Voltage6.3V
Heater Current0.3A
Max Plate Voltage150V
Max Power4.5W
Sensitivity24 mA/V
Gain Factor38
Internal Impedance1.6kΩ
Pinout9-pin Noval
Era1956
RarityCollector